Note that these are not the most recent tax brackets. For the 2018 tax brackets, click here. Every year, the IRS adjusts more than 40 tax provisions for inflation.
If you experience sudden attacks of severe knee pain and your knee also becomes red and hot, the cause is likely to be gout, which is a type of arthritis. Gout is caused by a build-up of uric acid (a waste product) in the body, which can form crystals in the joints. These crystals cause the joints to become inflamed and painful. Gout will cause severe pain in the knee and limit movement of the joint. You may feel pain even when you're resting, including at night.
Hard to say: Typically osteoarthritis in the knee causes pain limited to the knee itself and not really the whole leg. It may just be a referred pain for the knee or you may have something else causing pain in the leg in addition to your osteoarthritis.